风化软岩弃渣在道路基层的应用研究

doi:10.11896/cldb.25020177

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Abstract Weathered soft rock waste was used to replace crushed stone in cement-stabilized base for urban main road, and composite stabilizers composed of cement and soil stabilizers were used to treat solidified weathered soft rock aggregate. The performance and microstructure of weathered soft rock mixed aggregates under different stabilizers were investigated via compressive strength, water stability, XRD, SEM, and thermal analysis. The findings show that the stabilized weathered soft rock aggregates exhibit equivalent or superior compressive strength and water stability compared to conventional cement-stabilized crushed stone, with a maximum increase of 0.8 MPa in 7 d compressive strength. The 7 d compressive strength and the water stability coefficient of weathered soft rock mixed aggregates are enhanced by 0.2—1.1 MPa and 0.01—0.05, respectively, compared to those treated with the cement stabilizer. After 14, 28, and 60 days of curing, the composite stabilizer enhances the compressive strength and the water stability coefficient of weathered soft rock mixed aggregates by 50.56%—64.71% and 4.17%—8.07%, respectively. Both the compressive strength and saturated compressive strength exhibited quadratic polynomial relationships with curing age. When stabilized with the Type E soil stabilizer (8% SN + 0.015% Type E), the specimen has the best mechanical performance, exhibiting the 60 d compressive strength of 8.1 MPa and water stability coefficient of 0.95. The composite stabilizer promotes superior hydration compared to cement stabilizer in stabilizing weathered soft rock aggregates, generating more hydration products including C-S-H and ettringite. The needle-like, gel-like product interconnects with scattered sheet-like soft rock particles and enhances the compressive strength of the weathered soft rock mixed aggregates.

Key words： road engineering solidified weathered soft rock aggregate experimental research weathered soft rock waste microstructure

Published: 25 November 2025 Online: 2025-11-14

CLC number:

U416.1

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	Articles by authors
	LIU Lei
	YAO Yong
	ZHANG Lingling
	TANG Zixin
	QIU Weibo

Cite this article:

LIU Lei,YAO Yong,ZHANG Lingling, et al. Research on the Application of Weathered Soft Rock Waste in Road Base[J]. Materials Reports, 2025, 39(22): 25020177-9.

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https://www.mater-rep.com/EN/10.11896/cldb.25020177 OR https://www.mater-rep.com/EN/Y2025/V39/I22/25020177

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